执行下面Python代码后，输出的结果是？（ ）
def double_elements(lst):
for i in range(len(lst)):
lst[i] *= 2
return lst
lstB = [1, 2, 3]
double_elements(lstB)
print(lstB, double_elements(lstB))
[1, 2, 3] [2, 4, 6]
[2, 4, 6] [4, 8, 12]
[4, 8, 12] [4, 8, 12]
[1, 2, 3] [4, 8, 12]